From 7396fa818d6278694a44840f389ddc40a3269a9a Mon Sep 17 00:00:00 2001 From: Srikar Dronamraju Date: Wed, 11 Apr 2012 16:05:16 +0530 Subject: [PATCH] uprobes/core: Make background page replacement logic account for rss_stat counters Background page replacement logic adds a new anonymous page instead of a file backed (while inserting a breakpoint) / anonymous page (while removing a breakpoint). Hence the uprobes logic should take care to update the task->ss_stat counters accordingly. This bug became apparent courtesy of commit c3f0327f8e9d ("mm: add rss counters consistency check"). Signed-off-by: Srikar Dronamraju Cc: Linus Torvalds Cc: Ananth N Mavinakayanahalli Cc: Jim Keniston Cc: Linux-mm Cc: Oleg Nesterov Cc: Andi Kleen Cc: Christoph Hellwig Cc: Steven Rostedt Cc: Arnaldo Carvalho de Melo Cc: Masami Hiramatsu Cc: Anton Arapov Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20120411103516.23245.2700.sendpatchset@srdronam.in.ibm.com Signed-off-by: Ingo Molnar --- kernel/events/uprobes.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 29e881b..c5caeec 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -160,6 +160,11 @@ static int __replace_page(struct vm_area_struct *vma, struct page *page, struct get_page(kpage); page_add_new_anon_rmap(kpage, vma, addr); + if (!PageAnon(page)) { + dec_mm_counter(mm, MM_FILEPAGES); + inc_mm_counter(mm, MM_ANONPAGES); + } + flush_cache_page(vma, addr, pte_pfn(*ptep)); ptep_clear_flush(vma, addr, ptep); set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot)); -- 2.7.4